package websocket;

import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.handler.codec.http.websocketx.TextWebSocketFrame;

import java.time.LocalDateTime;

/**
 * @author: zlz
 * @date: 2021/9/13 21:04
 * @description:
 * @since: JDK1.8
 * TextWebSocketFrame 表示一个文本帧
 */
public class WebSocketHandler extends SimpleChannelInboundHandler<TextWebSocketFrame> {
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, TextWebSocketFrame msg) throws Exception {
        System.out.println("服务器收到消息:" + msg.text());
        // 回复消息
        ctx.channel().writeAndFlush(new TextWebSocketFrame("服务器时间" + LocalDateTime.now() + msg.text()));
    }

    /**
     * 当web客户端连接后触发
     *
     * @param ctx
     * @throws Exception
     */
    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        // longText唯一，shortText不唯一
        System.out.println("handlerAdded被调用" + ctx.channel().id().asLongText());
        System.out.println("handlerAdded被调用" + ctx.channel().id().asShortText());
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        System.out.println("handlerRemoved被调用" + ctx.channel().id().asLongText());
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        System.out.println("异常发生" + cause.getMessage());
        ctx.close();
    }
}
